Separation and simultaneous capture of CO2 and SO2 from flue gas of combustion process

摘要

The present invention relates to a process for simultaneously removing CO2 and SO2 from flue gas produced by a combustion process, wherein (a) producing an exhaust stream containing CO2 and SO2 by performing a combustion process that burns fuel and air (b). ) Producing a first compressed gas stream by compressing the exhaust stream in a first compression step; (c) having a feed side and a permeate side, CO2 and SO2 over nitrogen and CO2 and SO2 over oxygen. Providing a first membrane selectively permeable to SO2, (d) passing at least a portion of the first compressed gas stream across the feed side, and (e) removing CO2 from the feed side. And (f) withdrawing a first permeate stream enriched in CO2 and SO2 from the permeate side at a pressure below the first compressed gas stream (g) CO2 enriched stream And the steps of passing the first permeate stream to a separation process to produce SO2-enriched stream.